The water solubility of the methanol distillation pressure tower and atmospheric pressure tower is not up to standard
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For the coal-to-methanol plant, the synthesis catalyst is now in its later stages of use; the peak temperature is 258°C. The water-solubility levels of the liquid obtained from the two methanol distillation towers are not up to standard, while all other parameters meet the requirements for first-class quality. Sometimes the quality rating is 1+3, other times it’s 1+9; anything below 1+9 does not meet the standards. Adjustments have been made over the past 10 days, but the cause has not been identified. I am sharing the operational and control parameters here with experts in the field, hoping they can help analyze and provide solutions
Steps have been taken to increase the pre-tower vent temperature and the secondary cooling exhaust temperature
I’m using my phone to look at it; I can’t see your pictures clearly... The fact that the solubility of the two towers is not up to standard is definitely due to problems with the pre-treatment towers... It basically involves adding extraction water, increasing the reflux rate, raising the vent temperature, and checking whether the overflow is normal……
It’s taken quite clearly, but it won’t work when sent out. We’ve tried everything as suggested by Pre-Tower, but it doesn’t work! !
I think since the poster mentioned that we are already in the later stage of using the synthetic catalyst, the amount of paraffin and long-chain alkanes produced by the synthesis system must increase. These substances are usually removed through the drainage pipe at the liquid level in the pre-reaction reflux tank. To ensure thorough separation of these substances within the reflux tank, a certain amount of deionized water needs to be added to it. Additionally, it’s important to pay attention to the liquid level in the reflux tank, ensuring it remains at the level of the drainage pipe.
It’s already quite mature; it can’t be that reason
Increase the amount of extraction water and drain the alkanes oil from the reflux tank to see how much comes out →_→ It might be due to a problem with the equipment
I think you should analyze the boiling range of methanol, compare the initial and final boiling points to see whether it is the light components or the heavy components that have an impact, and then make adjustments accordingly; the methods for making such adjustments are more or less the same.
This phenomenon can also occur at low operating pressures in methanol synthesis